JSON Parse error:Unrecognized token xxx

原文

fetch("http:/example.com", {method: "POST",
  body: JSON.stringify(
    {
      uname: uname,
      password: password      
    }
  )
})
.then((response) => response.json())
.then((responseData) => {
  AlertIOS.alert(
      "POST Response",
      "Response Body -> " + JSON.stringify(responseData.body)
  )
}).done();
       this.props.navigation.navigate("Home")
   };

修改后的  response.text()代替response.json()

fetch("http:/example.com", {method: "POST",
  body: JSON.stringify(
    {
      uname: uname,
      password: password      
    }
  )
})
.then((response) => response.text())
.then((responseData) => {
  AlertIOS.alert(
      "POST Response",
      "Response Body -> " + responseData
  )
}).done();
       this.props.navigation.navigate("Home")
   };